9 CHANNEL IR RECEIVER USING PIC16C55 MICROCONTROLLER
This circuit is an infrared receiver using the PIC16C55 8bit microcontroller (click here MICROCHIP). The received signal is captured by D1(infrared receive LED), amplified by U1A and sliced by U1B. A 50K pot is available to adjust the sensitivity of the receive signal. Pin RA2 is the input to the microcontroller, the serial data must match the transmit protocol that was programmed by yourself (see the IR transmit circuit in this issue). Nine outputs are available with buffers ULN2803 (check ONSEMI for specifications), these buffers are powerful enough to drive any relay. LS1 and LS2 are shown in the diagram, you can easily add more relays or add other circuitry for control.